XCTest framework in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a test case class in XCTest.

iOS Swift

import XCTest

class MyTests: [1] {
}

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AXCTestCase

BUIViewController

CNSObject

DAppDelegate

Attempts:

3 left

💡 Hint

Common Mistakes

Using UIViewController instead of XCTestCase.

Forgetting to inherit from any class.

Test case classes in XCTest must inherit from XCTestCase to gain testing capabilities.

2fill in blank

medium

Complete the code to define a test method that XCTest will run.

iOS Swift

func [1]() {
    XCTAssertEqual(2 + 2, 4)
}

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AadditionTest

BtestAddition

CcheckAddition

DverifyAddition

Attempts:

3 left

💡 Hint

Common Mistakes

Naming test methods without the 'test' prefix.

Using spaces or special characters in method names.

Test methods must start with 'test' so XCTest recognizes and runs them automatically.

3fill in blank

hard

Fix the error in the assertion to check if a value is true.

iOS Swift

XCTAssert[1](isReady)

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ANil

BEqual

CFalse

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using XCTAssertFalse when expecting true.

Using XCTAssertEqual for boolean checks.

To assert a boolean is true, use XCTAssertTrue in XCTest.

4fill in blank

hard

Fill both blanks to set up and tear down test resources.

iOS Swift

override func [1]() {
    super.[1]()
    // setup code here
}

override func [2]() {
    super.[2]()
    // teardown code here
}

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AsetUp

BtearDown

CviewDidLoad

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using viewDidLoad instead of setUp or tearDown.

Not calling super in overridden methods.

setUp() runs before each test, tearDown() runs after each test to prepare and clean up.

5fill in blank

hard

Fill all three blanks to write a test that expects an error to be thrown.

iOS Swift

func testError() [3] {
    XCTAssertThrows[1](try someFunctionThat[2](), "Expected error")
    // Additional checks can be done here
}

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AError

BThrows

Cthrows

DThrow

Attempts:

3 left

💡 Hint

Common Mistakes

Using XCTAssertThrow instead of XCTAssertThrowsError.

Omitting 'try' before the function call.

Not marking the test method with 'throws'.

XCTAssertThrowsError checks if a function throws an error; the function call uses 'try' and the method name uses 'throws'.